Submitted on: 16 November 2011.
Revised on: 10 December 2011.
Accepted on: 06 January 2012.
POSTGRADUATE MEDICAL JOURNAL
http://reply.papertrans.cn/3/252/25121/25121-22.png
Submitted on: 25 July 2019.
Revised on: 06 August 2019.
Accepted on: 22 August 2019.
POSTGRADUATE MEDICAL JOURNAL---OXFORD UNIV PRESS
http://reply.papertrans.cn/3/252/25121/25121-24.png
Submitted on: 23 October 2020.
Revised on: 04 December 2020.
Accepted on: 29 December 2020.
POSTGRADUATE MEDICAL JOURNAL---OXFORD UNIV PRESS
http://reply.papertrans.cn/3/252/25121/25121-26.png
Submitted on: 17 September 2018.
Revised on: 01 October 2018.
Accepted on: 21 October 2018.
POSTGRADUATE MEDICAL JOURNAL
http://reply.papertrans.cn/3/252/25121/25121-28.png
http://reply.papertrans.cn/3/252/25121/25121-29.png
http://reply.papertrans.cn/3/252/25121/25121-30.png